# Math Help - Am I doing this calculus problem right?? (related rates)?

1. ## Am I doing this calculus problem right?? (related rates)?

Here is the question #42 part A and B

This is the work I have done so far and I would like to know if it is right

If I am doing anything wrong please correct me. Also when I replace r with (3/5)h I think it's supposed to be (3/6).

2. Originally Posted by imbored205
Here is the question #42 part A and B

This is the work I have done so far and I would like to know if it is right

If I am doing anything wrong please correct me. Also when I replace r with (3/5)h I think it's supposed to be (3/6).
All looks well...until you replace r in part (b).

It should be $r=\frac{2.5}{5}h$. You can make this adjustment by keeping in mind that the radius has a value of 3 only when the height is 6. It is also good to take note that the radius is half the value of the height withing the cone...

--Chris